CN100521854C - Phase controlled regulative electronic ballast of fluorescent light with extremely wide range - Google Patents
Phase controlled regulative electronic ballast of fluorescent light with extremely wide range Download PDFInfo
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- CN100521854C CN100521854C CNB021424721A CN02142472A CN100521854C CN 100521854 C CN100521854 C CN 100521854C CN B021424721 A CNB021424721 A CN B021424721A CN 02142472 A CN02142472 A CN 02142472A CN 100521854 C CN100521854 C CN 100521854C
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- 238000000034 method Methods 0.000 claims abstract description 49
- 238000010521 absorption reaction Methods 0.000 claims abstract description 48
- 230000001052 transient effect Effects 0.000 claims abstract description 48
- 230000010355 oscillation Effects 0.000 claims abstract description 13
- 238000007493 shaping process Methods 0.000 claims description 39
- 239000003990 capacitor Substances 0.000 claims description 36
- 238000005086 pumping Methods 0.000 claims description 12
- 230000000452 restraining effect Effects 0.000 claims description 8
- 230000005669 field effect Effects 0.000 claims description 6
- 229910044991 metal oxide Inorganic materials 0.000 claims description 6
- 150000004706 metal oxides Chemical class 0.000 claims description 6
- 239000004065 semiconductor Substances 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 5
- 238000010304 firing Methods 0.000 abstract description 2
- 238000013459 approach Methods 0.000 abstract 1
- 230000003534 oscillatory effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 13
- 241000196324 Embryophyta Species 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 238000002156 mixing Methods 0.000 description 8
- 238000012937 correction Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000010009 beating Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 244000287680 Garcinia dulcis Species 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
- H05B41/39—Controlling the intensity of light continuously
- H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
- H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
- H05B41/3924—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by phase control, e.g. using a triac
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
- H05B41/39—Controlling the intensity of light continuously
- H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
- H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
- H05B41/3925—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by frequency variation
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Abstract
In order to achieving wide dimming range for compact and tubular fluorescent lamps, two novel control approaches are proposed. (i) Novel techniques for suppressing oscillatory effects in the Triac circuit so as to maintain stable Triac operation over a wide firing angle range and (ii) a hybrid dimming control technique in the ballast inverter circuit for achieving wide dimming range from 100% to about 3%. Concerning point (i) both dissipative and non-dissipative energy absorption schemes (EAS) are proposed to suppress the transient effects in the Triac circuit when the Triac is turned on. The essence of the EAS is to ensure that the Triac circuit can be operated in a stable manner without oscillations or inadvertent turn-off. With respect to pint (ii) a hybrid dimming method is proposed in which unlike traditional control methods that use inverter frequency control only for dimming purposes, both dc link voltage and inverter frequency are varied. The essence of the new dimming control is to reduce the range of the inverter frequency variation so that the overall dimming range can be made as wide as possible.
Description
Technical field
The present invention relates to phased (phase controlled) dimmable electronic ballast, the two-way three end thyristors of TW two wire control (Triac-controlled) ballast for example, relating in particular to can be from the 100% this ballast that fluorescent lamp is carried out light modulation to about 3% the dimming scope.
Background technology
At present, also do not have on the market to use common double to three end thyristor dimmers with fluorescent lamp power at 100% compact fluorescent lamp of regulating in less than 3% scope.In order to use two-way three end thyristor dimmers in the dimming scope of from 100% to about 3% non-constant width, the light intensity of fluorescent lamp to be controlled, must satisfy two conditions.The two-way three end thyristors that the SCR thyristor that first condition is provided with by two reverse parallel connections (anti-parallel) is formed must move with stationary mode in trigger angle (firing angle) scope of non-constant width.Second condition is that light-dimming method must be able to be controlled and turns down fluorescent lamp power downwards.Prior art can realize from 100% to about dimming scope of 20% to 30%, up to the present still untapped go out to have market prospects dimming scope is extended to about 3% technology downwards.
Summary of the invention
The invention provides a kind of method, fluorescent lamp is carried out phase-controlled dimming control, wherein said fluorescent lamp is controlled by the electric ballast that is connected to power supply by phased device, phased device is controlled the angular range of described power connection, wherein this angular range changes between 0 ° to 180 °, and wherein by the direct current connection voltage and the switching frequency (switching frequency) that change described ballast fluorescent lamp power is controlled at least a portion angular range.
In a preferred embodiment, in the first of angular range, make direct current connect voltage and be maintained fixed and change switching frequency, on the remainder of angular range, then change direct current simultaneously and connect voltage and switching frequency.In this embodiment, first can be corresponding to 0 ° to 90 ° angular range.
Phased device preferably includes two-way three end thyristors (Triac), and also is provided with device in the present embodiment, in order to suppress the transient oscillation of two-way three end thyristor circuits when the two-way three end thyristor conductings.Can use dissipation energy to absorb (dissipative energy absorption) technology or non-dissipation energy absorption (non-dissipative energy absorption) technology, preferably be used in combination this two kinds of technology, transient oscillation is suppressed.
From other aspect, the invention provides a kind of method that is used for the electric ballast of fluorescent lamp is carried out brightness adjustment control, wherein between AC power and described ballast, be provided with two-way three end thyristors, and wherein said method is included in when making described two-way three end thyristor conductings with the energy absorption technology, and the vibration of described two-way three end thyristors is suppressed.
The energy absorption technology can be dissipation energy absorption techniques, non-dissipation energy absorption techniques or be used in combination this two kinds of technology.
From another aspect widely, the invention provides a kind of device, be used for the electric ballast of fluorescent lamp is carried out brightness adjustment control, this device comprises: the device that described ballast is connected to AC power; Be connected in the input of described ballast and the phased device between the described power supply, be used to control the angular range of described power connection; Output inverter (output inverter) is used to regulate fluorescent lamp; And the device that direct current connection voltage is provided for described output inverter.Wherein, each device is set, makes the direct current that at least a portion angular range, changes output inverter simultaneously connect voltage and switching frequency for brightness adjustment control is provided.
In a possible embodiment, in the time of in trigger angle is in first scope, direct current connection voltage is maintained fixed and changes switching frequency separately, and in the time of in trigger angle is in second scope, direct current connects voltage and switching frequency all changes.
The device that is used to provide direct current to connect voltage can be incoming line current shaping device (input linecurrent shaper), booster converter (boost converter) for example, and when angular range at 0 ° between 90 ° the time, direct current connection voltage is maintained fixed and the switching frequency variation, and when angular range during greater than 90 °, direct current connects voltage and switching frequency all changes.
Phased device preferably includes two-way three end thyristors, and other device can be set, and is used for suppressing when two-way three end thyristor conductings the vibration of these two-way three end thyristors.This restraining device can be dissipation energy absorption plant, non-dissipation energy absorption plant or be used in combination this two kinds of devices.
From another aspect widely, the invention provides a kind of device, be used for the electric ballast of fluorescent lamp is carried out brightness adjustment control, this device comprises the two-way three end thyristors that are arranged between AC power and the described ballast, and the device that suppresses this two-way three end thyristors vibration when described two-way three end thyristor conductings.
Restraining device can be made of the dissipation energy absorption plant.For example the dissipation energy absorption plant can be made of the resistor-capacitor circuit-diode circuit that is arranged between two-way three end thyristors and the incoming line current shaping device, wherein resistor with capacitors in series diode in parallel with resistor.In addition, the dissipation energy absorption plant also can be made of the resistor-capacitor circuit-switching circuit that is arranged between two-way three end thyristors and the incoming line current shaping device, wherein resistor with capacitors in series switch in parallel with resistor, therefore capacitor gets final product ground connection after being suppressed when initially vibrating, and works as the part of electromagnetic interface filter.Switch is preferably power metal oxide semiconductor field-effect transistor (power Mosfet).In addition, the dissipation energy absorption plant also can be made of the resistor-capacitor circuit-inductor circuit that is arranged between two-way three end thyristors and the incoming line current shaping device, wherein capacitor and resistor in series, and inductor is in parallel with resistor and with second resistor in series, therefore capacitor gets final product ground connection after being suppressed when initially vibrating, and works as the part of electromagnetic interface filter.
Restraining device can be made of non-dissipation energy absorption plant.The device of the input current of instantaneous increase current shaping device when this non-dissipation energy absorption plant can be included in two-way three end thyristor conductings.The device that is used to increase this input current can comprise the device that the input voltage of described current shaping device is carried out differential.
Restraining device had preferably both comprised the dissipation energy absorption plant, also comprised non-dissipation energy absorption plant.
Briefly see, the invention provides and a kind of the electric ballast of fluorescent lamp is carried out the device of brightness adjustment control, wherein said device can make fluorescent lamp power maximum rated fluorescent lamp power 3% to 100% between scope in change.
Description of drawings
Below will be by example and accompanying drawings some embodiment of the present invention, wherein:
Fig. 1 has shown the basic wiring schematic diagram of fluorescent lamp with two-way three end thyristors control dimmable ballast;
Fig. 2 is the functional-block diagram according to the dimmable electronic ballast of the embodiment of the invention;
Fig. 3 a and Fig. 3 b have illustrated mixing control method of the present invention;
Fig. 4 a to Fig. 4 c has schematically shown: (a) the incoming line current shaping device that uses in embodiments of the present invention, (b) general transient energy principle of absorption, (c) the general transient energy principle of absorption of selectivity;
Fig. 5 has shown the equivalent electric circuit of current shaping device shown in Figure 4;
Fig. 6 a to Fig. 6 d has illustrated that four kinds of different dissipation energies absorb circuit;
Fig. 7 has illustrated that non-dissipation energy absorbs circuit;
Fig. 8 has illustrated that another kind of non-dissipation energy absorbs circuit;
Fig. 9 has shown the curve chart of the voltage and current that measures in two-way three end thyristor outputs place that do not have energy absorption;
Figure 10 a and Figure 10 b have shown the curve chart of the voltage and current that measures in two-way three end thyristor outputs place of having only dissipation energy to absorb;
Figure 11 a and Figure 11 b have shown the curve chart of the voltage and current that measures in two-way three end thyristor outputs place with the absorption of dissipation and non-dissipation energy;
Figure 12 has schematically shown a kind of output inverter that uses in the present invention;
Figure 13 a and Figure 13 b have shown in embodiments of the present invention as (a) light intensity of two-way three end thyristor trigger angle functions and (b) fluorescent lamp power;
Figure 14 a and Figure 14 b have shown in the present invention and have used among the embodiment of fluorescent lamp power Linear as (a) light intensity of two-way three end thyristor trigger angle functions and (b) fluorescent lamp power;
Figure 15 has schematically shown a kind of direct current connection voltage method that is used to control;
Figure 16 has shown that schematically another kind is used to control direct current and connects voltage method;
Figure 17 has shown another embodiment of energy absorption circuit;
Figure 18 has shown another alternative of energy absorption circuit;
Figure 19 has shown another embodiment of energy absorption circuit.
Embodiment
In order to obtain small-sized and broad dimming scope fluorescent tube, the control method of two kinds of novelties has been proposed: (i) be used for suppressing the innovative techniques of oscillation effect, can this on broad trigger angle scope, keep stable two-way three end thyristors operation at two-way three end thyristor circuits; (ii) the mixing dimming control technique in the ballast inverter circuit can this obtain from 100% to about 3% broad dimming scope.For (i), propose to adopt simultaneously dissipativeness and non-dissipativeness energy absorption circuit (EAS), so that when two-way three end thyristor conductings, suppress the transient effect in the two-way three end thyristor circuits.The essence of EAS is to guarantee that two-way three end thyristor circuits can move with stationary mode, not vibration or unexpected the disconnection.For (ii), propose to adopt a kind of mixing light-dimming method, different with the traditional control method that only adopts inverter frequency control for the light modulation purpose, direct current connects voltage and inverter frequency all changes.The essence of this new brightness adjustment control is to reduce the scope that inverter frequency changes, thereby makes total dimming scope wide as far as possible.
As shown in Figure 1, the input of ballast is connected to AC power by two-way three end thyristors.The power (the perhaps Lux level of fluorescent lamp) of the trigger angle control fluorescent lamp by regulating two-way three end thyristors.
Dimmable electronic ballast of the present invention can comprise two mains, i.e. incoming line current shaping device and output inverter, and the functional-block diagram of this structure is shown in Fig. 2.L
SIt is the power supply inductance of power supply.The function of current shaping device is that line current IS is shaped as output voltage V with two-way three end thyristors
S' have identical appearance, thereby the input impedance of current shaping device is always ohmic.
The output inverter level with the fluorescent lamp Current Regulation to reference value I
Lamp, ref, I
Lamp, refBe from importing phased alternating voltage V
S' derive.Above-mentioned two-stage connects voltage V with direct current
DcWith fluorescent lamp current reference I
Lamp, rcfAnd be connected to each other.
Be provided with the mixing brightness adjustment control in a preferred embodiment of the invention, wherein need direct current connection voltage and inverter frequency all to change.Direct current connects the mode of voltage and inverter frequency variation according to determining for the selected circuit layout of input current reshaper.In some cases, direct current connection voltage and inverter frequency can change together in whole trigger angle scope, and in other cases, only inverter frequency changes (direct current connects voltage and keeps constant simultaneously) in a part of trigger angle scope, and direct current connects voltage and inverter frequency all changes in the trigger angle scope of remainder.
For the input current reshaper, a kind of selection is to adopt booster converter, and also will be with this use as example explanation mixing light-dimming method.Suppose that hereinafter AC power is 220V and 50Hz.
Shown in Fig. 3 a, when the trigger angle θ of two-way three end thyristors makes V with incoming line current shaping device when being 0 °≤θ≤90 °
DcKeep constant, and as θ〉make V 90 ° times
DcReduce.For 0 °≤θ≤90 ° (shown in Fig. 3 a),, make V in order to reduce fluorescent lamp power
DcKeep constant and make the switching frequency f of output inverter
SwIncrease with θ increases.That is to say,, realize brightness adjustment control by FREQUENCY CONTROL for 0 °≤θ≤90 °.For θ〉90 ° (shown in Fig. 3 b), in order to control fluorescent lamp power (increase (curve (a)), constant (curve (b)) or reduce (curve (c))), reduce direct current and connect voltage V
DcAnd make f
SwAlso change.Thereby connect voltage control and FREQUENCY CONTROL by carrying out direct current simultaneously, promptly realized brightness adjustment control this a part of trigger angle of two-way three end thyristors.
It is advantageous adopt mixing control model, this be because:
A. under low loading condition (for example 5% of 25W), power demand only is that the trigger angle of several watts and two-way three end thyristors is very big.Because the output voltage of two-way three end thyristors is very low, too high if voltage boosting dc voltage is compared with input voltage, then the efficient of input current reshaper (being generally booster converter) is very low.Reduce direct current and connect the power loss that voltage can reduce incoming line current shaping device.
B. the sensitivity of the FREQUENCY CONTROL ballast in the output inverter is less.Reduce if direct current connects voltage, the excursion of the switching frequency of inverter also will reduce, and so just might obtain the dimming scope of non-constant width within the actual limit that inverter frequency changes.
C. for θ〉90 °, outer in inverter frequency control also in addition with direct current connection voltage control, in whole dimming scope, just can make filament wattage almost keep constant so at an easy rate.
A. incoming line current shaping device
Illustrating in Fig. 4 a of incoming line current shaping device.The power circuit of reshaper is by forming with the lower part:
1. electromagnetic interference (EMI) filter---in order to suppress the high frequency noise that ballast produced, do not make it enter power supply.
2. input inductor L
i---in order to the minimum inductance in the input circuit to be provided.It has also increased the characteristic impedance of input circuit, thereby can reduce at the beat amplitude of (current ringing) of the electric current that two-way three end thyristor switchings place produce.
3. diode bridge---be full-wave rectifier.Its major function is with phased alternating voltage V
S' rectification is direct voltage V
In
4. the current shaping circuit---its major function is with input current I
InBe shaped as and V
InThe waveform that conforms to, thus the source electric current (is I
s) will with V
S' profile conform to.Fig. 4 a has shown the DC/DC converter of boost type, and this current transformer generally is used for power factor correction.The input current of its assurance booster converter conforms to the input voltage after the rectification.And galvanic current is pressed V
DcRegulated in output place.Except the boost type current transformer, other current transformer topology, the SEPIC, flyback (flyback) and the Cuk current transformer that for example possess suitable control method also can be used for this input current shaping feature.Input capacitance C
InIn order to filter voltage ripple by current transformer produced.
The circuit operation
By investigating the circuit response in half frequency period of ac power frequency, operation describes for circuit.Fig. 4 a is used to describe the ballast operation under the stable state.By means of equivalent electric circuit explanation transient operation shown in Figure 5, wherein two-way three end thyristors (Triac) are representative with the SCR thyristor, and have considered the phased voltage source V through rectification
S, rect'.Below stable state and transient operation will be described.
Steady outstanding operation
Shown in Fig. 4 a, control I
InWith V
InWaveform conform to, and regulate V
DcTo the interior voltage levvl (as shown in Figure 3) of desired specified tolerances.With current controller control main switch S
bOn-off mode (use gating signal V
g).At this with V
Dc' (the i.e. V that reduces in proportion
DcBe worth) and reference voltage V
RefCompare.By making output voltage error (is V
e) with input voltage (be V
In) profile multiplies each other and produce current reference I
Ref, wherein this input voltage profile is V
InThe value of Jiang Diing (is V in proportion
In') and transient voltage pulse V
dAnd, and V
dObtain by differentiator (differentiator) or pulse generator in two-way three end thyristor conducting moments.Make power switch S by a kind of like this mode
bSwitch, thereby to inductor current I
LbProfile carry out shaping, make the input current I of booster converter
InWaveform shaping be and V
InWaveform conform to.Use C
InWith V
InThe voltage ripple filtering.
In order as shown in Figure 3 direct current to be connected voltage V
DcProfile control, (it extracts V with peak detector
InMaximum) control V
RefAmplitude and V
DcWith V
Dc' ratio (representing) with η.Therefore, V
RefBe fixed for 0 °≤θ≤90 ° with η.In order to reduce V
DcTo be used for θ〉90 °, can be according to V
InAnd reduce V
RefAnd/or η.V
InAlso be used for output inverter is produced desired fluorescent lamp current reference.
Transient operation
Fig. 4 a can be reduced to equivalent electric circuit shown in Figure 5.As shown in Figure 5, L
i', C
InAnd R
InForm the damped harmonic oscillation circuit, wherein L
i'=L
i+ L
S, L in the formula
SBe the AC power inductance.Because voltage V
S, rect' being applied on the equivalent electric circuit, the transient period begins when two-way three end thyristor conductings.When the conducting of the brilliant lock LC pipe of two-way three ends, I
InWith cross-over connection C
InVoltage all have transient state and beat.For guaranteeing that two-way three end thyristors can unexpected not disconnect, I when two-way three end thyristor normallies
InCan not be zero or negative value.Otherwise the conduction SCR thyristor in the two-way three end thyristors will be opened in normal " conducting " cycle interruption.The damping coefficient of described resonant circuit and equivalent load R
InNumerical value is relevant.Be this class problem of avoiding beating and being caused, or it reduces to minimum to the major general, provide a kind of transient energy to absorb scheme by transient state.This scheme can realize by some energy absorption circuits (EAS), and described energy absorption circuit comprises dissipativeness and non-dissipativeness, and is as described below.Purpose is to make cross-over connection C
InEquiva lent impedance less, thereby can absorb transient energy and reduce vibration and beat.
Dissipation energy absorbs circuit
For the dissipation method being provided, can increasing the circuit that is used for the dissipative part transient energy that is shown among Fig. 6 a, it is connected across C
InOn.Fig. 6 b represents by R
T, C
TAnd D
TResistor-capacitor circuit-diode (RCD) of forming absorbs circuit.Work as V
InWhen increasing suddenly, D
TOpen circuit, and C
TImpedance very little (can ignore).This moment is if apply V
In, cross-over connection C
InEffective resistance promptly equal R
InWith R
TParallel connection (is R
In//R
T).Therefore, the partial resonance energy is at R
TIn dissipate and resonance oscillation attenuation.As a result, the amplitude of beat of the voltage and current in the lc circuit is all reduced.D
TAs C
TDischarge path, to reduce absorption resistance R
TIn energy loss.
The another kind of circuit that can carry out with RCD circuit identical function is shown among Fig. 6 c.This circuit is called the RCS circuit, comprises a resistor, a capacitor and a switch.Switch S when two-way three end thyristor conductings
TThe temporary transient disconnection.Guarantee at S with postponing control
TThe transient state end of beating before connecting.Therefore, the input transient state is beated and is subjected to R
TDamping.Subsequently, S
TRemain on " connection " state, thereby make C
TAlso play the effect of electromagnetic interface filter.A kind of practical plan of realizing the RCS circuit is to adopt power metal oxide semiconductor field-effect transistor as S
TUnder this scheme, the power metal oxide semiconductor field-effect transistor with intrinsic reverse parallel connection (inherent anti-parallel) diode provides the function of RCD circuit and the two combination of RCS circuit.
Except using active element, can also use inductor L
TReplace the diode D among Fig. 6 b
TWith the switch S among Fig. 6 c
TThis circuit is shown in Fig. 6 d.When two-way three end thyristor conductings, because the cross-over connection inductor will produce back electromotive force, transient inductance electric current no better than zero.The inductor branch road is considered to open circuit.After switching transient, inductor will become short circuit branch.Thereby L
TPlay the D that knows clearly
TAnd S
TEffect.
It should be noted that the EAS that only dissipates also is not enough to transient suppression effect in the broad phase angle scope of two-way three end thyristors.Therefore for effective transient suppression effect, make two-way three end thyristor stable operations, preferably use non-dissipation EAS.
Non-dissipation energy absorbs circuit
When two-way three end thyristor conductings, voltage puts in power converter and the load.The existence of power supply inductance and input capacitance has promptly constituted resonant circuit.When cross-over connection input inductance and electric capacity and when applying voltage, can produce oscillation effect usually.The principle that non-dissipation energy absorbs circuit is to absorb transient energy in power converter shown in Fig. 4 b and/or load.By using synchronous circuit (for example differentiator or marginal detector), can detect the connection moment of phased circuit (for example two-way three end thyristors).Synchronous circuit produces control signal subsequently, delivers to input power control circuit, thus the instantaneous input demand of power converter that increased for power supply.The additional demand of this unexpected increase makes power converter and/or load can absorb transient energy and transient suppression jitter effect.In this way, input current will be not vanishing or negative value suddenly, and two-way three end thyristors can accident not end.
Fig. 4 a has shown a kind of particular of this principle, and this scheme is passed to transient energy in the output capacitor of input current reshaper by the instantaneous input resistance that reduces the current shaping device.This can be by detecting V
InThe voltage forward position and instantaneous increase Fig. 4 a in current reference realize.Fig. 7 has shown the I that obtains thus
RefAnd V
In'.Can pass through V
InCarry out differential and realize the method, thereby when two-way three end thyristor conductings, promptly can produce less transient pulse V
d(Fig. 4 a).V subsequently
dTo be superimposed on V
In' go up to produce I
RcfExtracurrent demand during two-way three end thyristor conductings makes more energy be passed to the output capacitor of current shaping circuit.Therefore, this method is passed to direct current with resonant energy and connects capacitor, and is non-dissipativeness.Can realize this non-dissipation EAS by on the current reference circuit of the incoming line current rectifier shown in Fig. 4 a, using differential circuit.
Between transient period because resonance, V arranged
InMay be higher than V
Dc, the booster converter among Fig. 4 a may move undesired (for booster converter, output voltage should be higher than input voltage).A kind of possibility method of guaranteeing the normal operation of booster converter is that between transient period direct current being connected voltage reference (is the V among Fig. 4 a
Ref) set to such an extent that be higher than standard value, thereby make V
DcBe higher than C
InOn voltage beat.
Another kind method is to adopt as Fig. 4 a and clamp diode D shown in Figure 8
p, with V
InBe fixed in V
t(it is less than V
Dc).Booster converter thereby can between transient period, carry out normal voltage and boost.V
tCan obtain by a node from power circuit.V for example
tBe V
DcThe voltage of dividing potential drop node, as shown in Figure 8.
Shown in Fig. 4 c, can also in second power stage or load, absorb transient energy.Here shown and transient energy can have been absorbed the particular example of circuit application in some circuit of electronic ballast.This example has shown the electric ballast that uses charge pump circuit.Differentiator is used as synchronous circuit, detecting two-way three end thyristor conducting moments, and sends instruction to modulator, to increase the input current demand when the two-way three end thyristor conductings.By the switching frequency of control switch shown in Fig. 4 c, can change the impedance Z of power circuit
1And Z
2, transient energy is guided in power circuit and the load, and is absorbed therein.
The another kind possibility method that absorbs transient energy is with electric charge pumping (charge pump) capacitor C
ChAs low impedance path, when two-way three end thyristor conductings, allow electric current (transient energy) to flow to inverter circuit from two-way three end thyristors.The electric charge pumping technology that many forms are arranged, the proposition of this technology mainly are the circuit of power factor correction that is used to be connected directly to the electronic equipment of AC power.These schemes all are to be designed for the complete sinusoidal input voltage with two-way three end thyristor dimmers usually, and therefore existing electric charge pumping technology can not directly be used on two-way three end thyristors control tunable optical compact fluorescent lamp.But can be at the purpose of energy absorption rather than power factor correction and the principle of electric charge pumping is made amendment.
Figure 17 shows a kind of low-cost single-stage electric ballast that is proposed, and it does not use active electric current shaping prime.This design cost is lower, because of its front stage circuits is only used passive component.Electric charge pumping capacitor C
ChBe connected to voltage source V
Ch(the resonant inductor L from output inverter
rObtain), electric current is able to from V
In' flow to inverter.As selection, also can from circuit, obtain V by other node
ChBy adjusting coupling transformer T
rThe turn ratio and C
ChValue, V
ChPeak value can set to such an extent that be higher than V
In'.Thereby can control diode D
ChBlocking-up phase and conducting phase and rectifier diode D
1～D
4
By C
ChAbsorb or from C
ChThe quantity of electric charge that flows out will with V
In' variation change pro rata.In the research document, electric charge pumping principle is widely known by the people, and is used to carry out power factor correction [R1, R2], and wherein the input voltage of equipment is level and smooth sinusoidal voltage.But for the situation of using two-way three end thyristor dimmer circuits, what apply on the equipment is non-sinusoidal voltage, and in the output of two-way three end thyristor dimmers, the sharp-pointed forward position of chopping voltage is not smooth waveform, but in this embodiment of the invention, adopts C
ChAbsorb the transient resonance energy.Especially after two-way three end thyristors trigger, V
In' value increase suddenly, and electric charge pumping capacitor provides low impedance path for subtransient current, and at D
ChThis electric current will pass through C during blocking-up
ChFlow to the inverter load.This specific character has been introduced the required function of two-way three end thyristor conductings absorption current pulse afterwards.The amplitude of this current impulse is by T
rThe turn ratio and C
ChValue determine.
In order to make input current level and smooth, can be with little series reactor L
ChBe connected the output (DC side) and the C of rectifier
ChBetween.Generally this inductor does not use with conventional charge pumping circuit (this conventional charge pumping circuit is not to be designed for two-way three end thyristor equipment), but in the application of using two-way three end thyristor dimmers, this inductor is extremely important, because it can keep the electric current in the two-way three end thyristors to flow when two-way three end thyristor conductings, thereby guarantee the stable operation of two-way three end thyristor circuits.Figure 18 has illustrated this effect.But, L
ChValue can not be excessive, otherwise switch moment to C at two-way three end thyristors
ChCurrent impulse will reduce.This is with the function of impair absorption resonant energy.
Also propose to use electric charge pumping capacitor, finish the similar functions of absorption current pulse as a kind of optional circuit in two-way three end thyristor conducting moments with valley filling (vally-filled) circuit.This circuit is shown in Figure 19.In valley filling circuit, introduce resistor R
VFThereby, dissipative part resonant energy when electric charge extracts the capacitor charging.In this manner, jitter effect can greatly be cut down.
No matter in current shaping circuit and/or inverter circuit, transient energy (when two-way three end thyristor conductings) can be absorbed.Can respectively or combine and use dissipativeness and non-dissipativeness EAS, thereby provide effective transient state suppressing so that two-way three end thyristor stable operations.But, be used in combination dissipativeness and non-dissipativeness EAS than using wherein a kind of EAS that more effective transient state suppressing can be provided separately.
Except EAS, it is before two-way three end thyristor conductings that another kind electric current is beated reduces to minimum method, guarantees at C
InOn can keep enough initial voltage (V
C, 0).If C
InThe part charging, then resonance effect will weaken.I
InThe amplitude of beat depend on V between transfer period
S, rcct' amplitude (be V
S, rect' (0)) C and before switching
InOn initial voltage.In order to describe, the input resistance of supposing the input current reshaper is for infinitely great.I as can be known
InWobble component will be at ± I
InBetween change, wherein
Thereby work as V
C, 0During increase
Reduce.A kind of possible method is control S
bThe switching duration, thereby make V
C, 0The current shaping device is out of service during less than a certain numerical value, and this numerical value is determined by following formula
I wherein
In(t) be I
InSteady-state value.
An experimental rig is used to assess the performance of EAS.With the compact fluorescent lamp (CFL) of a 25W as load.AC supply voltage is 220V, 50Hz.Control the light modulation of the CFL with control circuit shown in Figure 4 with two-way three end thyristor dimmers.Fig. 9 has shown in two-way three end thyristor outputs place (Fig. 4), has not used measured electric current under the described EAS situation.As can be seen, these two-way three end thyristor circuits are unsettled.Transient effect causes voltage and current all to vibrate.When electric current vanishing or negative value, two-way three end thyristor accidents are ended.
Second group of test is to use dissipativeness EAS to carry out.In the RCS circuit, use power metal oxide semiconductor field-effect transistor as S
T, the result is the function that circuit has RSD and the combination of RCS circuit.Figure 10 a has shown the waveform of the voltage and current that records in two-way three end thyristor outputs place when trigger angle is set at about θ=45 °.Figure 10 b has shown the correlated results when trigger angle is θ=135 °.Compare with Fig. 9, most of as can be seen transient effect is suppressed by described dissipation circuit, although can also observe very little oscillation effect on the waveform of measuring during from θ=135 °.
The 3rd group of test is used to assess the validity of using dissipativeness and non-dissipativeness EAS simultaneously.Figure 11 a and Figure 11 b show that respectively (Figure 11 is a) and when θ=135 ° (Figure 11 b), the electric current and the voltage that record in two-way three end thyristor outputs place when trigger angle θ=45 °.By increasing current reference Iref in two-way three end thyristor conducting moments, transient effect further is inhibited as can be seen.This has proved the validity that is used in combination described dissipativeness and non-dissipativeness EAS.Non-dissipativeness EAS can move two-way three end thyristor dimmers in the scope of broad phase angle, can not meet accident and end.
B. output inverter
Voltage-type half bridge series resonance shunt load inverter (voltage-fed half-bridgeseries-resonant parallelloaded inverter, HBSRI) be shown among Figure 12, this inverter connects voltage fed by the output direct current of input current reshaper, and is used to control the light modulation of fluorescent lamp.Can carry out brightness adjustment control by following three kinds of possibility methods.
1) Constant Direct Current with changeable switch frequency connects voltage
S
1And S
2Alternation switch.By control S
1And S
2Switching frequency f
Sw, can change L
rReactance, thereby can regulate fluorescent lamp power.
2) the variable direct current with constant switching frequency connects voltage
Not the control switching frequency, but (promptly pass through control V by the amplitude of regulating direct current connection voltage
Dc) control fluorescent lamp power.f
SwSelect to such an extent that be slightly higher than the resonance frequency of resonant tank circuit.
3) the variable direct current with changeable switch frequency connects voltage
This method combines 1,2 two kind of method.The basis of this method is to use the fluorescent lamp current controller to connect under the voltage at direct current the fluorescent lamp Current Regulation is arrived desirable value.
The principle of mixing brightness adjustment control is to change the inverter direct current to connect voltage and inverter switching frequency, thereby controls fluorescent lamp power in required mode.To illustrate that below changing direct current connects voltage method.
Can be by monitoring input voltage V
InOr phase angle θ controls direct current connection voltage V
DcFigure 15 has shown functional block f
1, it is with DC input voitage V
InAnd/or trigger angle θ is as input parameter.Functional block f
1Produce required reference signal V
Ref(can change), and with itself and the contravarianter voltage V that reduces in proportion
DcCompare.Proportionality coefficient is K.Can change V
RefThereby change direct current and connect voltage.
Another kind can carry out direct current and connect voltage-controlled method and be shown in Figure 16.In this implementation method, V
RefFixing, and proportionality coefficient K is controlled.K is controlled voltage signal v
cControl, v
cFrom functional block f
2And f
2Input parameter be V
InAnd/or θ.That is to say, according to V
InAnd/or θ controls the proportionality coefficient K among Figure 16.
In the example of above-mentioned use booster converter as incoming line current shaping device, the mixing controlling schemes below adopting.As shown in Figure 3, when 0 °≤θ≤90 °, with V
DcBe adjusted to a constant relatively value.Only by control f
SwAnd with the fluorescent lamp Current Regulation to I
Lampref(be independent of V
In).For θ〉90 °, V
DcReduce, and the fluorescent lamp current controller will be regulated f
SwThereby the fluorescent lamp electric current will be followed I
Lampref, f
SwCan increase, constant or reduce (shown in Fig. 3 b).
It may be noted that direct current connects voltage control and switching frequency control combines the special properties that the ad hoc fashion that brightness adjustment control is provided depends on the current transformer layout that electric current line reshaper is used.Therefore in above-mentioned example, used booster converter,, will keep direct current to connect voltage during at least in 0 °≤θ≤90 ° and be higher than peak input voltage in order to guarantee that output voltage always is higher than input voltage (this is necessary for guaranteeing the normal operation of current transformer).For example, if power supply is 220V AC power (this means that peak value is approximately 312V in the time of 90 °), then AC line voltage will remain on about 400V in this scope, and as long as surpass peak input voltage, can reduce direct current and connect voltage.But, if same circuit structure moves under the 110V AC power, connect voltage because peak value, just may reduce direct current greatly about 156V in whole trigger angle scope, and still make direct current connect voltage simultaneously at all be higher than if having time current transformer input voltage.When the transducer that uses other type substitutes booster converter, for example use boost converter (step-upconvertor) or step-down controller (step-down convertor), promptly may in whole trigger angle, change direct current and connect voltage.
In fact, in order very in the wide region fluorescent lamp power to be carried out brightness adjustment control, in a part of dimming scope, must be used in combination direct current at least and connect voltage control and switching frequency control.On lower power levels especially like this, because if only use switching frequency control with power adjustments to for example about 10%, mean promptly and will use very high switching frequency that the result just needs very expensive element.In addition because fluorescent lamp power reduce only be inversely proportional to switching frequency, when switching frequency was increased to very high level, the corresponding minimizing in the fluorescent lamp power just became very narrow and small.
Carry out once experiment, adopted the dimming scope of the 25W compact fluorescent lamp of described EAS and dimming control technique with check.Measurement is still to be at lamp under the situation of " connection " state to carry out.Figure 13 a and Figure 13 b have shown light intensity (per unit) and the fluorescent lamp power that records respectively on the trigger angle scope.Obtained from 100% to 3% dimming scope.The variation of light intensity and fluorescent lamp power is near meeting cosine waveform under the trigger angle.
The controlling schemes that the present invention proposes can be used in combination (at this its content is drawn and be list of references) with the fluorescent lamp power Linear technology described in the USSN09/883151, has the light intensity of trigger angle and the varied appearance of fluorescent lamp power thereby change.Have the light intensity of trigger angle and the variation of fluorescent lamp power and can carry out linearisation with USSN 09/883151 described technology.Figure 14 a and Figure 14 b have shown linearizing the have light intensity of trigger angle and the variation of fluorescent lamp power.
Claims (30)
1. method that fluorescent lamp is provided phase-controlled dimming control, it is characterized in that, wherein said fluorescent lamp is by the electronic ballast control that is connected to power supply by phased device, described phased device is controlled described power connection angular region, wherein should connect angular region changes between 0 ° and 180 °, and wherein connect in the angular region, control fluorescent lamp power by the direct current connection voltage and the switching frequency that change described electric ballast simultaneously at least a portion.
2. method according to claim 1, it is characterized in that, wherein be maintained fixed and the variation of described switching frequency, and wherein all change at connection voltage of direct current described in the remainder of connecting angular region and described switching frequency at the connection of direct current described in the first that connects angular region voltage.
3. method according to claim 2 is characterized in that, wherein said first is corresponding to the angular range between 0 ° and 90 °.
4. method according to claim 1 is characterized in that, wherein said phased device comprises two-way three end thyristors.
5. method according to claim 4 is characterized in that, this method further comprises when described two-way three end thyristor conductings, and the transient oscillation of these two-way three end thyristor circuits is suppressed.
6. method according to claim 5 is characterized in that, wherein by the dissipation energy absorption techniques described transient oscillation is suppressed.
7. method according to claim 5 is characterized in that, wherein by non-dissipation energy absorption techniques described transient oscillation is suppressed.
8. method according to claim 5 is characterized in that, wherein by dissipation and non-dissipation energy absorption techniques described transient oscillation is suppressed.
9. method according to claim 5 is characterized in that, wherein by electric charge pumping capacitor circuit described transient oscillation is suppressed.
10. the device that the electric ballast to fluorescent lamp provides tunable optical to control is characterized in that described device comprises: the device that described electric ballast is connected to AC power; Be connected the input of described electric ballast and the phased device between the described power supply, be used to control the connection angular region of described power supply; Be used to regulate the output inverter of described fluorescent lamp; And connect the device of voltage for this output inverter provides direct current, and wherein be provided with device, connect the direct current that changes described output inverter in the angular region simultaneously at least a portion and connect voltage and switching frequency, so that brightness adjustment control to be provided.
11. device according to claim 10, it is characterized in that, wherein when described connection angle is in first scope, making described direct current connect voltage is maintained fixed, and described switching frequency is changed, and when described connection angle is in second scope, described direct current connection voltage and described switching frequency are all changed.
12. device according to claim 10 is characterized in that, the described device that wherein is used to provide described direct current to connect voltage is an incoming line current shaping device.
13. device according to claim 12 is characterized in that, wherein said incoming line current shaping device is a booster converter.
14. device according to claim 13, it is characterized in that, wherein when described connection angular region is between 0 ° and 90 °, making described direct current connect voltage is maintained fixed and makes described switching frequency to change, and, make described direct current connect voltage and described switching frequency all changes when described connection angular region during greater than 90 °.
15. device according to claim 10 is characterized in that, wherein said phased device comprises two-way three end thyristors.
16. device according to claim 15 is characterized in that, this device further comprises when described two-way three end thyristor conductings, the device that the vibration of described two-way three end thyristors is suppressed.
17. device according to claim 16 is characterized in that, wherein said restraining device comprises the dissipation energy absorption plant.
18. device according to claim 17, it is characterized in that, the described device that wherein is used to provide described direct current to connect voltage is an incoming line current shaping device, and described dissipation energy absorption plant comprises the resistor-capacitor circuit-diode circuit that is arranged between described two-way three end thyristors and the described incoming line current shaping device, wherein said resistor and capacitors in series, and described diode is in parallel with described resistor.
19. device according to claim 17, it is characterized in that, the described device that wherein is used to provide described direct current to connect voltage is an incoming line current shaping device, and described dissipation energy absorption plant comprises the resistor-capacitor circuit-switching circuit that is arranged between described two-way three end thyristors and the described incoming line current shaping device, wherein said resistor and capacitors in series, and described switch is in parallel with described resistor, thereby after described initial vibration is suppressed, can make described capacitor grounding and as the part of electromagnetic interface filter and work.
20. device according to claim 19 is characterized in that, wherein said switch is a power metal oxide semiconductor field-effect transistor.
21. device according to claim 17, it is characterized in that, the described device that wherein is used to provide described direct current to connect voltage is an incoming line current shaping device, and described dissipation energy absorption plant comprises the resistor-capacitor circuit-inductor circuit that is arranged between described two-way three end thyristors and the described incoming line current shaping device, wherein said capacitor and resistor in series, and described inductor is in parallel with described resistor and with second resistor in series, thereby after described initial vibration is suppressed, can make described capacitor grounding and as the part of electromagnetic interface filter and work.
22. device according to claim 16 is characterized in that, wherein said restraining device comprises non-dissipation energy absorption plant.
23. device according to claim 22, it is characterized in that, the described device that wherein is used to provide described direct current to connect voltage is an incoming line current shaping device, and described non-dissipation energy absorption plant comprises that moment increases the device of described current shaping device input current when described two-way three end thyristor conductings.
24. device according to claim 23 is characterized in that, the wherein said device that is used to increase input current comprises the device that the input voltage of described current shaping device is carried out differential.
25. device according to claim 16 is characterized in that, wherein said restraining device comprises dissipation and non-dissipation energy absorption plant.
26. device according to claim 16 is characterized in that, wherein said restraining device comprises electric charge pumping capacitor circuit.
27. a device that is used for fluorescent lamp is provided the control of electric ballast tunable optical comprises: be arranged on the two-way three end thyristors between AC power and the described electric ballast; And when described two-way three end thyristor conductings, the dissipation energy absorption plant that the vibration of these two-way three end thyristors is suppressed; Wherein said dissipation energy absorption plant comprises the resistor-capacitor circuit-diode circuit that is arranged between described two-way three end thyristors and the incoming line current shaping device, wherein said resistor and capacitors in series, and described diode is in parallel with described resistor.
28. a device that is used for fluorescent lamp is provided the control of electric ballast tunable optical comprises: be arranged on the two-way three end thyristors between AC power and the described electric ballast; And when described two-way three end thyristor conductings, the dissipation energy absorption plant that the vibration of these two-way three end thyristors is suppressed; Wherein said dissipation energy absorption plant comprises the resistor-capacitor circuit-switching circuit that is arranged between described two-way three end thyristors and the incoming line current shaping device, wherein said resistor and capacitors in series, and described switch is in parallel with described resistor, thereby after described initial vibration is suppressed, can make described capacitor grounding and as the part of electromagnetic interface filter and work.
29. device according to claim 28 is characterized in that, wherein said switch is a power metal oxide semiconductor field-effect transistor.
30. a device that is used for fluorescent lamp is provided the control of electric ballast tunable optical comprises: be arranged on the two-way three end thyristors between AC power and the described electric ballast; And when described two-way three end thyristor conductings, the device that the vibration of these two-way three end thyristors is suppressed; Wherein said dissipation energy absorption plant comprises the resistor-capacitor circuit-inductor circuit that is arranged between described two-way three end thyristors and the incoming line current shaping device, wherein said resistor and capacitors in series, and described inductor is in parallel with described resistor and with second resistor in series, thereby after described initial vibration is suppressed, can make described capacitor grounding and as the part of electromagnetic interface filter and work.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/948,994 | 2001-09-06 | ||
| US09/948,994 US7304439B2 (en) | 2001-09-06 | 2001-09-06 | Phase-controlled dimmable electronic ballasts for fluorescent lamps with very wide dimming range |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1407840A CN1407840A (en) | 2003-04-02 |
| CN100521854C true CN100521854C (en) | 2009-07-29 |
Family
ID=25488461
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021424721A Expired - Fee Related CN100521854C (en) | 2001-09-06 | 2002-09-06 | Phase controlled regulative electronic ballast of fluorescent light with extremely wide range |
Country Status (2)
| Country | Link |
|---|---|
| US (2) | US7304439B2 (en) |
| CN (1) | CN100521854C (en) |
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| CN101217848B (en) * | 2007-12-27 | 2011-07-13 | 李东方 | A dual-frequency mixed spectrum type and pulse width regulation type dimming electronic ballast |
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| TW200945953A (en) * | 2008-04-21 | 2009-11-01 | Fego Prec Ind Co Ltd | Phase-control dimming electronic ballast system and the control method thereof |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN1407840A (en) | 2003-04-02 |
| US20080030148A1 (en) | 2008-02-07 |
| US7304439B2 (en) | 2007-12-04 |
| US20030080696A1 (en) | 2003-05-01 |
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